diff --git a/die-with-parent.c b/die-with-parent.c
index c1268de..c005923 100644
--- a/die-with-parent.c
+++ b/die-with-parent.c
@@ -149,7 +149,7 @@ int main(int argc, char *const *argv) {
         } break;
         case ':':
             if (isprint(optopt)) {
-                eprintf("option requires argument: -%c", optopt);
+                eprintf("option requires argument: %c", optopt);
             } else {
                 eprintf("option requires argument: 0x%x", optopt);
             }
@@ -157,7 +157,7 @@ int main(int argc, char *const *argv) {
             break;
         case '?':
             if (isprint(optopt)) {
-                eprintf("unknown option: -%c", optopt);
+                eprintf("unknown option: %c", optopt);
             } else {
                 eprintf("unknown option: 0x%x", optopt);
             }